What is Ferrite Plates?
MnZn Block Ferrite Core (a.k.a. Ferrite Block, Ferrite Cube, Chunk Ferrite )refers to a magnetic core material made from a manganese-zinc (MnZn) ferrite compound, typically shaped into a block or rectangular form for use in electromagnetic applications such as transformers, inductors, and noise suppression devices.
1. What is the Material of Ferrite Block
Composition: A ceramic-like mixture of Manganese oxide (MnO), Zinc oxide (ZnO), and Iron oxide (Fe₂O₃).
Type: A soft ferrite, meaning it can be easily magnetized and demagnetized.
Electrical property: High electrical resistivity, which minimizes eddy current losses (important at high frequencies).
Magnetic property: High magnetic permeability (μ), allowing efficient magnetic flux coupling.
2. Structure: Block Core
A block ferrite core simply refers to its geometry — rectangular or square-shaped rather than ring (toroid), E, or U-shaped.
Typical forms:
• Rectangular slabs for custom magnetic assemblies
• Stacked blocks for transformers or chokes
• Machined blocks for magnetic circuits or shielding
3. What are the differences between MnZn and NiZn Ferrites?
| MnZn Ferrite | NiZn Ferrite | |
|---|---|---|
| Resistivity | Lower (10²-10³ Ω·cm) | Higher (10⁶-10⁸ Ω·cm) |
| Permeability | High (μ = 1000-15000) | Lower (μ = 10-1000) |
| Frequency range | Low-Medium (up to few MHz) | High (tens to hundreds of MHz) |
| Applications | Power transformers, inductors | RF chokes, EMI filters |
4. Typical Properties
| Typical Range | |
|---|---|
| Initial Permeability (μᵢ) | 1000 - 15000 |
| Saturation Flux Density (Bₛ) | 0.3 - 0.5 T |
| Curie Temperature | 120 - 220 °C |
| Resistivity | 10² - 10³ Ω·cm |
| Frequency Range | Up to a few MHz |
